| 摘要 |
There is provided a tool holder which greatly reduces frictional resistance between a locknut and a tapered collet, and substantially eliminates twisting of the tapered collet during tightening of the locknut. The tool holder comprises a locknut (13) which pushes a tapered collet (12) into a tapered hole (115) of a collet chuck body (11) to chuck a cutting tool (15), and between a reference end (123) of the tapered collet (12) and a collet supporting portion (131) opposed thereto, there is interposed is a bearing washer (14) to reduce frictional resistance between both contact surfaces. To both surfaces of this bearing washer (14), namely, to the respective surfaces which come into contact with the reference end (123) and collet supporting portion (131), surface treatment by any of ion nitriding, DLC (Diamond-Like Carbon) coating, and TiN coating is applied. <IMAGE> <IMAGE> |
